Machine for making punches.



No. 628,687 Patented luly 1|, I899.

A. J. BRADLEY. MACHINE FOR MAKING PUNOHE S. (Application filed June 15,1898.)

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1 m I mum] i N0. 628,687. A Patented July I], I899.

- A. J. BRADLEY.

MACHINE FOR' MAKING PUNCHES.

(Application filed June 15, 1896.) 2 Sheets-Sheet 2.

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III

UNITED STATES PATENT OFFICE.

ANDREIV J. BRADLEY, ST. LOUIS, MISSOURI, ASSIGNOR TO THE BRADLEY STENCILMACHINE COMPANY, OF MISSOURI.

MACHINE FOR MAKING PUNCHES.

SPECIFICATION forming part of Letters Patent No. 628,687, dated July 11,1899. Application filed June 15,1896. Serial No. 595,612. (No model.)

To aZZ whom it may concern:

Be it known that 1, ANDREW J. BRADLEY, a citizen of the United States,and a resident of the city of St. Louis, in the State of Missouri, haveinvented a new and useful Improvement in Machines for Making Punches, ofwhich the following is a specification.

My invention relates to the manufacture of punches. Its principal objectis to facilitate the process of forging a punch from a hot blank; and itconsists in a finishing-die the sides of whose design are formedparallel to the axis thereof.

lt'also consists in a punch-forging machine provided with a formingdieand a finishingdie having the same design, formed with its sidesparallel to the same axis, and means for causing said finishing-die tocontinue or complete the result produced by the forming-die.

It also consists in the parts and in the combination of partshereinafter described and claimed.

In the accompanying drawings, which form a part of this specification,Figure 1 is a horizontal section of a press provided with my invention,the section being taken on the line 1 1 of Fig. 2. Fig. 2 is a centralvertical section of the press on the line 2 2 of Fig. 1. Fig. 3 is afront view showing the machine in elevation, the View being taken on aplane behind the hand-wheel of the chuck. Fig. 3 is a rear view of saidmachine. Fig. 4 is a face view, and Fig. 5 is a cross-section, of thefirst forming-die, showing a draft. Fig. 6 is a face view, and Fig. 7 isa cross-section, of the second forming-die, showing the sides parallel.Figs. 8 and 9 are side views of the blank after being operated on by thefirst and the second dies, respectively. Figs. 10 and 11 are perspectiveviews of the blank and the finished punch, respectively.

Myinvention may be utilized in divers kinds of presses; but a drop-press1 is most suitable therefor. The ram or hammer 2 of the press isprovided with a device or devices 3 adapted to hold forming-dies 4, aconvenient form of such device being dovetail grooves in its under face.The two forming-dies are engraved or otherwise formed with approximatelythe same design, one of said dies having the design cut slightly largerin contour drawings.

than is desired for the finished article and being formed with a draftor bevel, and the other die being formed with the edges of theprojecting design portion parallel and with the design made of the samesize as the finished article. The f orming-dies being mounted on thesame ram or hammer remain at a fixed distance apart. In fact, it isdesirable to have the two dies cut in the same plate in order to rendertheir relative positions permanent.

On the bed 5 of the press is a chuck 6 7, arranged to slidein suitableguides 8such, for instance, as the dovetail grooves shown in the Thechuck consists of a heavy block 6, arranged to slide in the grooves 8,and a second block 7, fitting into a chamber made therefor in the firstblock 6 and arranged to slide in grooves 9 in said first block 6. Theupper surfaces of said blocks are flush and their meeting faces havesteel bushings fitted thereto, which constitute the real jaws of thechuck and are made of a shape best suited for the blank to be operatedon. These steel jaws 10 preferably project above the blocks 6 7 in orderthe better to protect said blocks from the impact of the hammer.

A screw-threaded collar 11 is secured to the main block 6 of the chuckby supporting-bars 12,extending laterally therefrom, and through thiscollar works a threaded shaft 13. The outer end of this shaft has ahand-wheel 14: thereon and the inner end has a nut or ring 15 fastenedthereon to turn therewith. This ring fits in a space provided thereforbetween the face of the block 7 andia piece 16, mounted on said block 7,so that the block 7 is moved to and fro on the block 6, according as theshaft 13 is turned one way or the other. The effect of this movement isof course to open or close the chuck, although as the block 7 and theshaft are both mounted on the block 6 said block 6 remains stationaryduring such operation. For the same reason the movement of the block 6carries with it all parts of the chuck without altering their relativepositions. iently' effected by a hand-lever 17, pivotally fastened to alug 18, projecting from the middle portion of said block and pivotallyfulcrumed to a link 19, pivotally secured to the Such movement may beconvenframe of the press. Obviously other means for shifting the chuckmay be used in place of that described.

The sliding block 6 is limited in its 'tO-Etl1(1' fro movement byadjustable stops 20. Evidently these stops may be located on the frameof the press in the path of the block; but it is preferable to mountthem upon the block itself. As shown in the drawings, these stops mayconsist of screw-bolts 20, working in threaded hangers 21, dependingfrom said blocks 6. Nuts 22 will set them in any position to which theymay be adjusted. Y

The operation of the device is as follows: The forming-dies 4 are firstmounted 011 the drop hammer or ram in as nearly perfect alinement as ispracticable and parallel with the line of travel of the chuck, so thatthe impression made by one of said dies upon a blank held in the chuckcan be centered under the other die by-inerelyshifting the chuck. \Vhilethe chuck is centered beneath'each die successively, the adjustablestops 20 are turned until they strike the frame of the press and arethereby set to limit the movement of the chuck in both directions, sothat in either of its extreme positions thus ascertained the chuck isaccurately centered beneath one or the other of the two forming-dies.The blank 24 to be operated on is then placed While heated, preferablyto a bright cherry heat, between the open jaws of the chuck.

Then the hand-wheel 14: is turned to move the block 7 against the block6, thus clamping the blank between the steel bushings. The blank shownin the drawings is an ordinary bolt without a thread and is particularlyapplicable to the making of stencil-character punches forstencil-machines. Its shank fits between the steel jaws and its headrests on the circular steel bushing in suitable position to receive theimpact of the hammer. The hand-lever 17 is then shifted until the stop20 strikes the frame of the press, in which position the hot bolt isdirectly under the first forming-diethe die shown in Fig. 4. The

hammer then falls, causing the first die to,

impress its design pyramidally in said blank,

which is left as shown in Fig. 8. The hammer is then raised, thehand-lever is shifted as far as the stop will permit, (which is directlyunder the finishing-die,) and the hammer is again dropped, therebydisplacingthe pyramidal side portions back far enough to make all thelongitudinal edges of the projecting portion parallel and thuscompleting the formation of the face portion of the punch, which may be.ejected from the press by any suitable contrivance.

As the object sought to be attained'is parallelism of the sides of thedesign portion of the finished punch, it is obvious that thefinishing-die may be formed with aslight relief or clearance, which isthereverse of the draft or taper of a forming-die and the practicalequivalent of parallel sides.

What I claim is 1. A finishing-die for forming stencil-characterpunches, having the sides of its design formed parallel, substantiallyas described.

2. A machine for forging stencil-character punches, comprising afinishing-die mounted on the hammer and having the sides of its designformed parallel, substantially as described.

3. A machine for forming stencil-character punches,comprisingahammerhavingaforming-die and a finishing-die of the same design, said finishing-die having the sides of its design parallel, andmeans for centering the work relatively to each die successively,substantially as described.

4. A machine for making punches comprising the combination of twoformingdies mounted on the hammer, one of said dies having its designformed with a draft and the other die having the same design formed withparallel sides, a chuck movably secured to the bed of the press andlimiting devices for centering said chuck beneath each of said dies,substantially as and for the purpose set forth.

ANDREW J. BRADLEY. lVitnesses:

JAMES A. CARR, CHAS. E. WIsE.

